Mac: Add off-screen rendering support (issue #518).

- Build with the 10.7 SDK (set GYP_DEFINES='mac_sdk=10.7') to include Retina support in the cefclient OSR example.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1226 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/cef_browser.h

@@ -388,6 +388,17 @@ class CefBrowserHost : public virtual CefBase {
   /*--cef()--*/
   virtual void WasHidden(bool hidden) =0;
 
+  ///
+  // Send a notification to the browser that the screen info has changed. The
+  // browser will then call CefRenderHandler::GetScreenInfo to update the
+  // screen information with the new values. This simulates moving the webview
+  // window from one display to another, or changing the properties of the
+  // current display. This method is only used when window rendering is
+  // disabled.
+  ///
+  /*--cef()--*/
+  virtual void NotifyScreenInfoChanged() =0;
+
   ///
   // Invalidate the |dirtyRect| region of the view. The browser will call
   // CefRenderHandler::OnPaint asynchronously with the updated regions. This